Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..745..522k&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy. AIP Conference Proceedings, Vo
Astronomy and Astrophysics
Astronomy
1
Galactic Nuclei, Circumnuclear Matter, And Bulges, Radio Galaxies, X-Ray Sources, X-Ray Bursts, Jets And Bursts, Galactic Winds And Fountains
Scientific paper
We examine a systematic comparison of jet-knots, hotspots and radio lobes recently observed with Chandra and ASCA. This report will discuss the origin of their X-ray emissions and investigate the dynamics of the jets. The data was compiled at well sampled radio (5 GHz) and X-ray frequencies (1keV) for more than 40 radio galaxies. We examined three models for the X-ray production: synchrotron (SYN), synchrotron self-Compton (SSC) and external Compton on CMB photons (EC). For the SYN sources - mostly jet-knots in nearby low-luminosity radio galaxies - X-ray photons are produced by ultrarelativistic electrons with energies 10-100 TeV that must be accelerated in situ. For the other objects, conservatively classified as SSC or EC sources, a simple formulation of calculating the ``expected'' X-ray fluxes under an equipartition hypothesis is presented. We confirmed that the observed X-ray fluxes are close to the expected ones for non-relativistic emitting plasma velocities in the case of radio lobes and majority of hotspots, whereas considerable fraction of jet-knots is too bright at X-rays to be explained in this way. We examined two possibilities to account for the discrepancy in a framework of the inverse-Compton model: (1) magnetic field is much smaller than the equipartition value, and (2) the jets are highly relativistic on kpc/Mpc scales. We also briefly discuss the other possibility, namely that the observed X-ray emission from all of the jet-knots is synchrotron in origin.
Kataoka Jun
Stawarz Łukasz
No associations
LandOfFree
Unifying X-ray Emission Properties of Large Scale Jets, Hotspots and Lobes in AGN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Unifying X-ray Emission Properties of Large Scale Jets, Hotspots and Lobes in AGN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unifying X-ray Emission Properties of Large Scale Jets, Hotspots and Lobes in AGN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1746500